Discharge printing



2o grounds on fabrics containing organic esters of 311,253 both of October 8, 1928, the unsulpho- 75 Patented Sept. 12, 1933 V UNITED STATES PATENT OFFICE DISCHARGE PRINTING Camille Dreyfus, New York, N. Y.

No Drawing. Application March 25, 1931 Serial No. 525,340

9 Claims. (01. s-)

This invention relates to method of producing fabric are preferably insoluble or difficultly soldifferential color effects on fabrics, and particuuble coloring matter which are applied dispersed larly fabrics containing organic esters of celluor solubilized by a dispersing agent such as a lose, by discharge printing with a saponiiying sulpho fatty acid, particularly sulphoricinoleic 5 agentacid (Turkey red oil). As instances of suitable 60 An object of my invention is to produce disbodies may be mentioned the coloring matters charge prints on fabrics containing organic esor organic compounds or classes of coloring ters of cellulose, and particularly those fabrics matters or compounds referred to in United which have been colored with dyestuffs that States Patents Nos. 1,618,413, 1,545,819, 1,600,277,

10 cannot be discharged by the ordinary methods 1,641,965, 1,618,415, 1,694,414, 1,679,935, and 5 now employed. British Patents Nos. 239,470, 263,260 and. 283,081,

A further object of my invention is to disthe coloring matters of the British Patents charge dyed fabrics containing organic ester of 299,349 and 300,920 or their corresponding cellulose yarn by at least partially saponifying United States patent application S. No. 287,646,

the organic ester of cellulose so that it loses its filed June 22, 1928 containing one or more keto- 70 affinity for the 'dyestuif present. Other objects acidyl groups and particularly acetoacetyl of this invention will appear from the following groups, the nitro-diarylamines specified in Britdetailed description. ish Patent 305,560 or its corresponding United The production of designs. on colored back- States patent applications Nos. 311,252 and cellulose, particularly cellulose acetate, has herenated thiazole derivatives of United States Pattofore offered serious difficulties, since many of cut 1,871,673 granted August 16, 1932, the azo the dyes that colorsuch fabrics cannot be disdyes containing the xanthene or thioxanthene charged bythe ordinary discharge methods. I nucleus of British Patent 311,433 or its correhave found that many of such dyestuffs may be sponding United States patent application No. 80 discharged by the employment of an alkaline 323,211 filed December 1, 1928, and the azo dyes material so as to at least partially saponify the of British Patent 310,827, or its corresponding cellulose ester to convert the same into recon- United States patent application No. 297,098 filed stituted cellulose which has no affinity for such August 2, 1928, containing the anthraquinone dyestuffs. I nucleus.

In accordance with my invention, I discharge The dyed fabric has locally applied thereto a print fabrics containing yarns of organic esters discharging agent which comprises an alkali or of cellulose which have been dyed with a dyealkaline salt that saponifies at least partially the stufi that has little or no afiinity for cellulose, cellulose ester. Examples of such alkaline maby locally applying thereto a composition conterials are sodium hydroxide, potassium hy- 0 taining a saponifying agent for the cellulose esdroxide, sodium carbonate, etc. The alkaline ter. After application of the saponifying agent agent is present in rather concentrated form, in and fixing the same, the fabric is washed, and case of sodium hydroxide the amount being 10 the dyestufl which has no afllnity for the reto 30% by weight. The saponifying' agent is 40 constituted cellulose is thus removed from. the generally applied in the form of a paste containsflpollified p ing thickening agents such as gum tragacanth,

The fabric to be treated contains yarns of British gum or other dextrines, water-soluble organic esters of cellulose, such as cellulose acecellulose ethers, agar agar, starches and the like. tate, cellulose formate, cellulose propionate and If colored or illuminated discharges are de- 45 cellulose butyrate. The fabric to be treatedmay sired, the discharge agent may contain a dye- 10o consist wholly of yarns containing one or more stuff that has an affinity for cellulose and which organic esters of cellulose, or it may be a mixed is not affected deleteriously by the alkaline mafabric containing such yarns and yarns of terial present. Examples of such'dyestuffs are other fibres. the vat dyestuffs, but when these vat dyestuffs are 59 The fabric to be treated with the saponifying employed in the presence of hydrosulfite or other discharge agent is previously dyed or colored reducing agent, the amount of the latter is preferwlth any suitable dyestuif which has aflinity for ably kept at a minimum. vthe organic ester of cellulose material but lit- In order to obtain better penetration and tie or no aifinity for reconstituted cellulose. The quicker action of the alkaline material, the disdyestuffs employedv for dyeing cellulose acetate charge agent may contain a swelling "agent for the cellulose acetate or other organic ester of cellulose, examples of which are pyridine, the thiocyanates of sodium, potassium or ammonium, ethyl alcohol, methyl alcohol, diethylene glycol, etc.

The discharge agent may be zipplied in any suitable manner such as by means of embossed or engraved rollers or plates, or by brushing or spraying through stencils. After the local application of the discharge agent, the fabric may be steamed, and then washed with water which may be slightly acid, dried and given any other finishing treatment.

In order further to illustrate my invention but without being limited thereto, the following specific examples are given.

Example I A fabric consisting wholly of cellulose acetate yarn and dyed blue by means of 1:4 dimethyl diamino anthraquinone haslocally applied thereto by means of engraved rollers a paste of the following composition:

Parts by weight sodium hydrozide 26 e at r 20 Gum arable thickener (1:1) 55 .The fabric is dried and then steamed for 15 minutes with steam at atmospheric pressure. The fabric is then rinsed and dried. Discharge prints having white designs against a blue background are thus produced.

Example II Sodium hydroxide C, 26 Sodium hydrosuliito Sodium formaldehyde sulphoxylate. Ciba Pink B (Color Index No. 1207) The fabric is dried and then steamed for 15 minutes with steam at ordinary pressure. The fabric is then oxidized in a bath containing one gram per litre of soap and three grams per litre and. desire to secure by Letters Patent is:

1. Method of at least partially discharging the color from material comprising organic esters of cellulose which has been dyed with dyestufl having little or no aflinity for cellulose comprising at least partially saponifying the organic ester of cellulose.

2. Method of at least partially discharging the color from material comprising cellulose acetate which has been dyed with dyestuff having little or no affinity for cellulose comprising at least partiallysaponifying the cellulose acetate.

3. Method of producing difl'erential color effects on textile material comprising locally applying a saponifying agent to a fabric containing yarn of organic esters of cellulose which has been dyed with a dyestufl having little or no affinity for cellulose.

4. Method of producing difierential color effects on textile material comprising locally applying a saponifying agent to a fabric containing yarn of cellulose acetate which has been dyed with a dyestuif having little or no aflinity for cellulose.

5. Method of producing differential color effects onfabrics comprising locallyapplying a paste containing alkaline material corresponding to 10 to 30% of sodium hydroxide to a fabric containing yarn of organic esters of cellulose which has been dyed with a dyestufl' having little or no aflinity for celluolse.

6. Method of producing differential color effects on fabrics comprising locally applying a paste containing alkaline material corresponding to 10 to 30% of sodium hydroxide to a fabric containing yarn of cellulose acetate which has been dyed with a dyestuif having little or no affinity for cellulose.

'7. Method of producing diflerential color effects on textile material comprising locally applying to a fabric containing cellulose acetate yarn which has been dyed with a dyestuii having little or no affinity for cellulose a paste containing alkaline material and a swelling agent for the cellulose acetate.

8. Method of producing differential color effects on textile material comprising locally applying to a fabric containing cellulose acetate yarn which has been dyed with a dyestufi having,

little or no affinity for cellulose a paste containing alkaline material and a dyestufl having an affinity for cellulose.

9. Method of producing differential color effects on textile material comprising locally applying a saponifying agent to a fabric containing cellulose acetate yarn which has been dyed with 1: 4 dimethyl diamino anthraquinone.

CAME DREYFUS. 

